Aim 3: Determine if TEAR PATTERN (and resulting debridement) affects GAIT CHARACTERISTICS at the knee at 12 months post debridement Hypothesis 3: Subjects having debridement of a medial meniscus root tear or a tear that extends through the entire medial meniscus to the periphery will have greater adduction moment and tibial external rotation, and lower flexion angle range of motion than patients who have retention of circumferential fiber continuity or a lateral tear.